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-rw-r--r--ws.c344
1 files changed, 344 insertions, 0 deletions
diff --git a/ws.c b/ws.c
new file mode 100644
index 0000000000..b1efcd9d75
--- /dev/null
+++ b/ws.c
@@ -0,0 +1,344 @@
+/*
+ * Whitespace rules
+ *
+ * Copyright (c) 2007 Junio C Hamano
+ */
+
+#include "cache.h"
+#include "attr.h"
+
+static struct whitespace_rule {
+ const char *rule_name;
+ unsigned rule_bits;
+} whitespace_rule_names[] = {
+ { "trailing-space", WS_TRAILING_SPACE },
+ { "space-before-tab", WS_SPACE_BEFORE_TAB },
+ { "indent-with-non-tab", WS_INDENT_WITH_NON_TAB },
+ { "cr-at-eol", WS_CR_AT_EOL },
+};
+
+unsigned parse_whitespace_rule(const char *string)
+{
+ unsigned rule = WS_DEFAULT_RULE;
+
+ while (string) {
+ int i;
+ size_t len;
+ const char *ep;
+ int negated = 0;
+
+ string = string + strspn(string, ", \t\n\r");
+ ep = strchr(string, ',');
+ if (!ep)
+ len = strlen(string);
+ else
+ len = ep - string;
+
+ if (*string == '-') {
+ negated = 1;
+ string++;
+ len--;
+ }
+ if (!len)
+ break;
+ for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++) {
+ if (strncmp(whitespace_rule_names[i].rule_name,
+ string, len))
+ continue;
+ if (negated)
+ rule &= ~whitespace_rule_names[i].rule_bits;
+ else
+ rule |= whitespace_rule_names[i].rule_bits;
+ break;
+ }
+ string = ep;
+ }
+ return rule;
+}
+
+static void setup_whitespace_attr_check(struct git_attr_check *check)
+{
+ static struct git_attr *attr_whitespace;
+
+ if (!attr_whitespace)
+ attr_whitespace = git_attr("whitespace", 10);
+ check[0].attr = attr_whitespace;
+}
+
+unsigned whitespace_rule(const char *pathname)
+{
+ struct git_attr_check attr_whitespace_rule;
+
+ setup_whitespace_attr_check(&attr_whitespace_rule);
+ if (!git_checkattr(pathname, 1, &attr_whitespace_rule)) {
+ const char *value;
+
+ value = attr_whitespace_rule.value;
+ if (ATTR_TRUE(value)) {
+ /* true (whitespace) */
+ unsigned all_rule = 0;
+ int i;
+ for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++)
+ all_rule |= whitespace_rule_names[i].rule_bits;
+ return all_rule;
+ } else if (ATTR_FALSE(value)) {
+ /* false (-whitespace) */
+ return 0;
+ } else if (ATTR_UNSET(value)) {
+ /* reset to default (!whitespace) */
+ return whitespace_rule_cfg;
+ } else {
+ /* string */
+ return parse_whitespace_rule(value);
+ }
+ } else {
+ return whitespace_rule_cfg;
+ }
+}
+
+/* The returned string should be freed by the caller. */
+char *whitespace_error_string(unsigned ws)
+{
+ struct strbuf err = STRBUF_INIT;
+ if (ws & WS_TRAILING_SPACE)
+ strbuf_addstr(&err, "trailing whitespace");
+ if (ws & WS_SPACE_BEFORE_TAB) {
+ if (err.len)
+ strbuf_addstr(&err, ", ");
+ strbuf_addstr(&err, "space before tab in indent");
+ }
+ if (ws & WS_INDENT_WITH_NON_TAB) {
+ if (err.len)
+ strbuf_addstr(&err, ", ");
+ strbuf_addstr(&err, "indent with spaces");
+ }
+ return strbuf_detach(&err, NULL);
+}
+
+/* If stream is non-NULL, emits the line after checking. */
+static unsigned ws_check_emit_1(const char *line, int len, unsigned ws_rule,
+ FILE *stream, const char *set,
+ const char *reset, const char *ws)
+{
+ unsigned result = 0;
+ int written = 0;
+ int trailing_whitespace = -1;
+ int trailing_newline = 0;
+ int trailing_carriage_return = 0;
+ int i;
+
+ /* Logic is simpler if we temporarily ignore the trailing newline. */
+ if (len > 0 && line[len - 1] == '\n') {
+ trailing_newline = 1;
+ len--;
+ }
+ if ((ws_rule & WS_CR_AT_EOL) &&
+ len > 0 && line[len - 1] == '\r') {
+ trailing_carriage_return = 1;
+ len--;
+ }
+
+ /* Check for trailing whitespace. */
+ if (ws_rule & WS_TRAILING_SPACE) {
+ for (i = len - 1; i >= 0; i--) {
+ if (isspace(line[i])) {
+ trailing_whitespace = i;
+ result |= WS_TRAILING_SPACE;
+ }
+ else
+ break;
+ }
+ }
+
+ /* Check for space before tab in initial indent. */
+ for (i = 0; i < len; i++) {
+ if (line[i] == ' ')
+ continue;
+ if (line[i] != '\t')
+ break;
+ if ((ws_rule & WS_SPACE_BEFORE_TAB) && written < i) {
+ result |= WS_SPACE_BEFORE_TAB;
+ if (stream) {
+ fputs(ws, stream);
+ fwrite(line + written, i - written, 1, stream);
+ fputs(reset, stream);
+ }
+ } else if (stream)
+ fwrite(line + written, i - written, 1, stream);
+ if (stream)
+ fwrite(line + i, 1, 1, stream);
+ written = i + 1;
+ }
+
+ /* Check for indent using non-tab. */
+ if ((ws_rule & WS_INDENT_WITH_NON_TAB) && i - written >= 8) {
+ result |= WS_INDENT_WITH_NON_TAB;
+ if (stream) {
+ fputs(ws, stream);
+ fwrite(line + written, i - written, 1, stream);
+ fputs(reset, stream);
+ }
+ written = i;
+ }
+
+ if (stream) {
+ /*
+ * Now the rest of the line starts at "written".
+ * The non-highlighted part ends at "trailing_whitespace".
+ */
+ if (trailing_whitespace == -1)
+ trailing_whitespace = len;
+
+ /* Emit non-highlighted (middle) segment. */
+ if (trailing_whitespace - written > 0) {
+ fputs(set, stream);
+ fwrite(line + written,
+ trailing_whitespace - written, 1, stream);
+ fputs(reset, stream);
+ }
+
+ /* Highlight errors in trailing whitespace. */
+ if (trailing_whitespace != len) {
+ fputs(ws, stream);
+ fwrite(line + trailing_whitespace,
+ len - trailing_whitespace, 1, stream);
+ fputs(reset, stream);
+ }
+ if (trailing_carriage_return)
+ fputc('\r', stream);
+ if (trailing_newline)
+ fputc('\n', stream);
+ }
+ return result;
+}
+
+void ws_check_emit(const char *line, int len, unsigned ws_rule,
+ FILE *stream, const char *set,
+ const char *reset, const char *ws)
+{
+ (void)ws_check_emit_1(line, len, ws_rule, stream, set, reset, ws);
+}
+
+unsigned ws_check(const char *line, int len, unsigned ws_rule)
+{
+ return ws_check_emit_1(line, len, ws_rule, NULL, NULL, NULL, NULL);
+}
+
+int ws_blank_line(const char *line, int len, unsigned ws_rule)
+{
+ /*
+ * We _might_ want to treat CR differently from other
+ * whitespace characters when ws_rule has WS_CR_AT_EOL, but
+ * for now we just use this stupid definition.
+ */
+ while (len-- > 0) {
+ if (!isspace(*line))
+ return 0;
+ line++;
+ }
+ return 1;
+}
+
+/* Copy the line to the buffer while fixing whitespaces */
+int ws_fix_copy(char *dst, const char *src, int len, unsigned ws_rule, int *error_count)
+{
+ /*
+ * len is number of bytes to be copied from src, starting
+ * at src. Typically src[len-1] is '\n', unless this is
+ * the incomplete last line.
+ */
+ int i;
+ int add_nl_to_tail = 0;
+ int add_cr_to_tail = 0;
+ int fixed = 0;
+ int last_tab_in_indent = -1;
+ int last_space_in_indent = -1;
+ int need_fix_leading_space = 0;
+ char *buf;
+
+ /*
+ * Strip trailing whitespace
+ */
+ if ((ws_rule & WS_TRAILING_SPACE) &&
+ (2 <= len && isspace(src[len-2]))) {
+ if (src[len - 1] == '\n') {
+ add_nl_to_tail = 1;
+ len--;
+ if (1 < len && src[len - 1] == '\r') {
+ add_cr_to_tail = !!(ws_rule & WS_CR_AT_EOL);
+ len--;
+ }
+ }
+ if (0 < len && isspace(src[len - 1])) {
+ while (0 < len && isspace(src[len-1]))
+ len--;
+ fixed = 1;
+ }
+ }
+
+ /*
+ * Check leading whitespaces (indent)
+ */
+ for (i = 0; i < len; i++) {
+ char ch = src[i];
+ if (ch == '\t') {
+ last_tab_in_indent = i;
+ if ((ws_rule & WS_SPACE_BEFORE_TAB) &&
+ 0 <= last_space_in_indent)
+ need_fix_leading_space = 1;
+ } else if (ch == ' ') {
+ last_space_in_indent = i;
+ if ((ws_rule & WS_INDENT_WITH_NON_TAB) &&
+ 8 <= i - last_tab_in_indent)
+ need_fix_leading_space = 1;
+ } else
+ break;
+ }
+
+ buf = dst;
+ if (need_fix_leading_space) {
+ /* Process indent ourselves */
+ int consecutive_spaces = 0;
+ int last = last_tab_in_indent + 1;
+
+ if (ws_rule & WS_INDENT_WITH_NON_TAB) {
+ /* have "last" point at one past the indent */
+ if (last_tab_in_indent < last_space_in_indent)
+ last = last_space_in_indent + 1;
+ else
+ last = last_tab_in_indent + 1;
+ }
+
+ /*
+ * between src[0..last-1], strip the funny spaces,
+ * updating them to tab as needed.
+ */
+ for (i = 0; i < last; i++) {
+ char ch = src[i];
+ if (ch != ' ') {
+ consecutive_spaces = 0;
+ *dst++ = ch;
+ } else {
+ consecutive_spaces++;
+ if (consecutive_spaces == 8) {
+ *dst++ = '\t';
+ consecutive_spaces = 0;
+ }
+ }
+ }
+ while (0 < consecutive_spaces--)
+ *dst++ = ' ';
+ len -= last;
+ src += last;
+ fixed = 1;
+ }
+
+ memcpy(dst, src, len);
+ if (add_cr_to_tail)
+ dst[len++] = '\r';
+ if (add_nl_to_tail)
+ dst[len++] = '\n';
+ if (fixed && error_count)
+ (*error_count)++;
+ return dst + len - buf;
+}